bintels prices on televue are
1.25 " (2x) $180
2 " big (2x) $335
1.25 " (3X) $180
https://www.bintelshop.com.au/
i followed the link from their page eyepieces and did an televue barlow search and thats what came up
not sure if prices are current though
looks like the 2" comes with an adapter according to the picture best bet is to email or ring them